<div class="ui menu">
  <a class="active item" data-tab="first">First</a>
  <a class="item" data-tab="second">Second</a>
  <a class="item" data-tab="third">Third</a>
</div>
<div class="ui active tab segment" data-tab="first">First</div>
<div class="ui tab segment" data-tab="second">Second</div>
<div class="ui tab segment" data-tab="third">Third</div>